1. Rinse beans; drain. In a large saucepan, combine beans and the 6 cups water. Bring to boiling; reduce heat. Simmer, uncovered, for 10 minutes. Remove from heat. Cover and let stand for 1 hour. Drain and rinse beans.
2. Meanwhile, in a 3-1/2-, 4-, or 5-quart crockery cooker, combine onion, fennel, carrots, garlic, parsley, rosemary, and pepper. Place beans atop vegetables. Pour chicken broth over all.
3. Cover; cook on low-heat setting for 8 to 10 hours or on high-heat setting for 4 to 5 hours.
4. If using low-heat setting, turn to high-heat setting. Stir in chicken and tomatoes. Cover and cook for 30 minutes longer or until heated through on high-heat setting. Makes 4 to 6 servings.